straight shank twist drills, jobber length for brass 1.HSS 2.DIN338 3.15~20 degree helix angle ... . surface:Bright HSS straight shank twist drills, jobber length for brass-DIN338 Materials: HSSDIN33815~20°helix angle for drillTolerance of tool ... Application: Drilling into hard, brittle, short-chip materials, i.e., brass, bronze, phosphor bronze, magnesium alloys.Surface treatment: Bright Finish Main ...